Chemistry : Balancing Chemical Equations

What numbers are needed in the blanks to balance the following chemical equations?
Type these numbers separated by commas with no spaces in the answer.
Example :
Word Equation : Sulfur + Sulfuric acid → Sulfur dioxide + Water
Molecular Equation : _______ S + _______ H₂SO₄ → _______ SO₂ + _______ H₂O
Balanced Equation : S + 2 H₂SO₄ → 3 SO₂ + 2 H₂O
Answer : 1,2,3,2

Formats

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Quiz

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Fill in the blanks

Your Performance

1.
_______ Pb₃O₄ → _______ PbO + _______ O₂

Hint

Hint

2.
_______ CuO + _______ Na → _______ Cu + _______ Na₂O

Hint

3.
_______ Ca + _______ H₂O → _______ Ca(OH)₂ + _______ H₂

Hint

4.
_______ CaO + _______ HCl → _______ CaCl₂ + _______ H₂O

Hint

5.
_______ P + _______ O₂ → _______ P₂O₅

Hint

6.
_______ FeCl₃ + _______ SO₂ + _______ H₂O → _______ FeCl₂ + _______ HCl + _______ H₂SO₄

Hint

7.
_______ MnO₂ + _______ HCl → _______ MnCl₂ + _______ H₂O + _______ Cl₂

Hint

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